The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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GOODWILL AND INTANGIBLE ASSETS - Components of intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
INTANGIBLE ASSETS
Gross Carrying Amount	$ 352,649		$ 352,649		$ 307,225
Accumulated Amortization	(146,904)		(146,904)		(126,837)
Amortization of Intangible Assets	10,000	$ 8,400	20,100	$ 23,400
Impairment of Intangible Assets, Finite-lived	0	$ 0	0	$ 0
Acquired ANDA intangible assets
INTANGIBLE ASSETS
Gross Carrying Amount	103,394		103,394		64,704
Accumulated Amortization	(36,155)		$ (36,155)		(30,169)
Weighted Average Amortization Period			8 years 10 months 24 days
NDAs and product rights
INTANGIBLE ASSETS
Gross Carrying Amount	230,974		$ 230,974		230,974
Accumulated Amortization	(99,918)		$ (99,918)		(87,352)
Weighted Average Amortization Period			10 years
Marketing and distribution rights
INTANGIBLE ASSETS
Gross Carrying Amount	17,657		$ 17,657		10,923
Accumulated Amortization	(10,452)		$ (10,452)		(8,982)
Weighted Average Amortization Period			5 years 8 months 12 days
Non-compete agreement
INTANGIBLE ASSETS
Gross Carrying Amount	624		$ 624		624
Accumulated Amortization	$ (379)		$ (379)		$ (334)
Weighted Average Amortization Period			7 years